Using revolve command, revolve two curves, around the 3rd one, line, as revolve axis… Like on the image below:
You’ll end up with this…
From the top view, make a triangle using polyline, like on the picture below. You can turn off Osnap, it will be easier.
Fillet the sharpest angle with 2, and using Remove Knots, make that triangle one curve.
Using ArrayPolar command, array that triangle 5 times around the origin (that is, if you positioned the center of your object in the origin).
Using srfseam command, reposition the seam on both surfaces, so it is on the spoke… That means, it needs to be in between any two triangles. Trim those two surfaces with trim command using triangles.
Using polyline, connect edges of two trimmed surfaces. Refer to image below:
Do so for all 5 spokes.
Using sweep2 command, as rails select two edges of two surfaces (1 and 2 on image below), and as cross section curves, select two lines (3,4 on image)
Do this for all 5 sections, and join surfaces.